Method and wireless communication terminal for transmitting/receiving frame in wireless communication system

Abstract

Disclosed is a method for transmitting a frame of a wireless communication system. A non-AP STA receives a beacon frame comprising a request type field from an AP and can receive a downlink frame or transmit an uplink frame in accordance with a specific field value included in the beacon frame. Here, the request type field comprises a specific field for indicating a target wake time (TWT) for a low latency operation, and, if the value of the specific field is set as a first specific value, a broadcast TWT service period (SP) is a TWT SP for the low latency operation.

The invention claimed is: 
     
         1 . A non-access point station (non-AP STA) configured to operate in a wireless communication system, the non-AP STA comprising:
 a communication module; and   a processor configured to control the communication module,   wherein the processor is configured to:   receive a management frame including a target wake time (TWT) element related to scheduling a restricted TWT service period (R-TWT SP) and a quiet element related to a quiet interval from an access point (AP),   wherein the R-TWT SP indicates a TWT SP in which transmission of a latency sensitive traffic is prioritized,   wherein the quiet interval indicates a duration in which no transmission occurs, and   wherein the TWT element includes a TWT request type field including a specific field indicating a type of a frame transmitted during the TWT SP, and   when the R-TWT SP is configured to the non-AP STA,   receive or transmit the latency sensitive traffic according to a first specific value of the specific field,   wherein the quiet interval is ignored based on whether the quiet interval overlaps with the R-TWT SP.   
     
     
         2 . The non-AP STA of  claim 1 ,
 wherein the quiet interval is ignored, and the latency sensitive traffic is transmitted or received according to the first specific value during the R-TWT SP when the quiet interval overlaps with the R-TWT SP.   
     
     
         3 . The non-AP STA of  claim 1 ,
 wherein the quiet interval is ignored based on a result of a comparison between a first time point of the R-TWT SP based on the TWT element and a second time point of the quiet interval based on the quiet element.   
     
     
         4 . The non-AP STA of  claim 3 ,
 wherein the first time point is a start time of the R-TWT SP, and   wherein the second time point is a start time of the quiet interval.   
     
     
         5 . The non-AP STA of  claim 3 ,
 wherein the quiet interval is ignored when the first time point and the second time point are the same.   
     
     
         6 . The non-AP STA of  claim 3 ,
 wherein non-AP STAs scheduled for quiet intervals by the AP set network allocation vectors (NAVs) for the quiet intervals.   
     
     
         7 . The non-AP STA of  claim 6 ,
 wherein the first specific value indicates that transmission of the latency sensitive traffic is prioritized during the R-TWT SP.   
     
     
         8 . The non-AP STA of  claim 1 ,
 wherein a second specific value of the specific field indicates that transmission of frames of a feedback type is prioritized during a specific TWT SP.   
     
     
         9 . The non-AP STA of  claim 1 ,
 wherein the TWT element further includes a TWT information field including information related to a TID for the latency sensitive traffic.   
     
     
         10 . The non-AP STA of  claim 1 ,
 wherein, when the non-AP STA is affiliated with a multi-link device (MLD), the MLD is unable to transmit, while receiving the management frame on a specific link, a frame on a link other than the specific link.   
     
     
         11 . The non-AP STA of  claim 1 ,
 wherein a transmission process by the non-AP STA ends before a start time of the R-TWT SP when the transmission process is performed before the R-TWT SP.   
     
     
         12 . A method of transmitting a frame by a non-access point station (non-AP STA) configured to operate in a wireless communication system, the method comprising:
 receiving a management frame including a target wake time (TWT) element related to scheduling a restricted TWT service period (R-TWT SP) and a quiet element related to a quiet interval from an access point, AP,   wherein the R-TWT SP indicates a TWT SP in which transmission of a latency sensitive traffic is prioritized,   wherein the quiet interval indicates a duration in which no transmission occurs, and   wherein the TWT element includes a TWT request type field including a specific field indicating a type of a frame transmitted during the TWT SP; and   when the R-TWT SP is configured to the non-AP STA,   receiving or transmitting the latency sensitive traffic according to a first specific value of the specific field,   wherein the quiet interval is ignored based on whether the quiet interval overlaps with the R-TWT SP.   
     
     
         13 . The method of  claim 12 ,
 wherein the quiet interval is ignored, and the latency sensitive traffic is transmitted or received according to the first specific value during the R-TWT SP when the quiet interval overlaps with the R-TWT SP.   
     
     
         14 . The method of  claim 12 ,
 wherein the quiet interval is ignored based on a result of a comparison between a first time point of the R-TWT SP based on the TWT element and a second time point of the quiet interval based on the quiet element.   
     
     
         15 . The method of  claim 14 ,
 wherein the first time point is a start time of the R-TWT SP, and   wherein the second time point is a start time of the quiet interval.   
     
     
         16 . The method of  claim 14 ,
 wherein the quiet interval is ignored when the first time point and the second time point are the same.   
     
     
         17 . The method of  claim 14 ,
 wherein non-AP STAs scheduled for quiet intervals by the AP set network allocation vectors (NAVs) for the quiet intervals.   
     
     
         18 . The method of  claim 17 ,
 wherein the first specific value indicates that transmission of the latency sensitive traffic is prioritized during the R-TWT SP.   
     
     
         19 . The method of  claim 12 ,
 wherein a second specific value of the specific field indicates that transmission of frames of a feedback type is prioritized during a specific TWT SP.   
     
     
         20 . The method of  claim 12 ,
 wherein the TWT element further includes a TWT information field including information related to a TID for the latency sensitive traffic.   
     
     
         21 . The method of  claim 12 ,
 wherein, when the non-AP STA is affiliated with a multi-link device (MLD), the MLD is unable to transmit, while receiving the management frame on a specific link, a frame on a link other than the specific link.   
     
     
         22 . The method of  claim 12 ,
 wherein a transmission process by the non-AP STA ends before a start time of the R-TWT SP when the transmission process is performed before the R-TWT SP.